Question

Which three components are common to the circulatory systems of most living animals? A. arteries, veins, capillaries B. vessels, heart, circulating fluid C. aorta, ventricles, atria D. blood, heart, cavities

Answer 1

The answer is B. vessels, heart, circulating fluid

Answer 2

The three components that are common to the circulatory systems of most living animals are: B. VESSELS, HEART, CIRCULATING FLUID.

Blood is the circulating fluid. It is the connective tissue of liquid plasma and cells.
Heart is a muscular pump to move the blood and have it circulate throughout the body of living animals.
Blood vessels are arteries, capillaries and veins that deliver blood to all tissues.

The Circulatory System has two types. They are the open circulatory system and the close circulatory system.

An open circulatory system is one where the blood does not circulate inside blood vessels  but also flows into cavities that irrigate tissues.

A close circulatory system is one where the blood circulate only inside the blood vessels.